Yes, you can pursue a standalone Postgraduate (PG) program in Physics after completing your Undergraduate (UG) degree. Since you're currently pursuing your UG degree, you can:

1. _Appear for entrance exams_: Prepare for and take entrance exams like JAM (Joint Admission Test), JEST (Joint Entrance Screening Test), or university-specific entrance tests for PG programs in Physics.

2. _Check eligibility criteria_: Ensure you meet the eligibility criteria for PG programs in Physics, which typically include a Bachelor's degree in Physics or a related field with a minimum percentage of marks.

3. _Apply to universities_: Look for universities offering PG programs in Physics and apply accordingly. Some top universities for Physics in India include:

- IITs (Indian Institute of Technology)

- IISc (Indian Institute of Science)

- Central Universities

- State Universities

4. _Consider research opportunities_: If you're interested in research, look for universities with active research groups in Physics and explore opportunities for research-based PG programs.

Remember to plan ahead, prepare for entrance exams, and meet the eligibility criteria to secure a spot in a PG program in Physics.